EP3.29 Short-Term Outcomes of Cam Resection for Femoroacetabular Impingement Based on Preoperative Planning Incorporating Lateral Impingement

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ID: 331323
2026
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Abstract
Abstract Background In cam resection for femoroacetabular impingement (FAI), preoperative planning has traditionally focused on improving anterior impingement, which occurs during hip flexion and internal rotation. Previous simulation and clinical studies have demonstrated that such anterior-based planning can improve range of motion and patient-reported outcomes. However, in clinical practice, some patients continue to experience hip pain in positions involving abduction, suggesting the presence of lateral impingement. Despite this, the clinical relevance of lateral impingement and its impact on surgical outcomes have not been well established. Objective The purpose of this study was to compare clinical outcomes between cam resections performed based on anterior-only preoperative planning and those performed based on planning incorporating both anterior and lateral impingement. We hypothesized that incorporating lateral impingement into surgical planning would result in improved clinical outcomes. Methods Twenty patients with cam-type or combined-type FAI who underwent cam resection were included. Patients were divided into two groups: anterior-only planning and anterior plus lateral planning. Clinical outcomes were assessed using the modified Harris Hip Score (mHHS) and the Non-Arthritic Hip Score (NAHS). Changes in scores were compared between groups. In addition, the achievement rates of the Minimal Clinically Important Difference (MCID) and Patient Acceptable Symptom State (PASS) were evaluated. Results There were no significant differences in baseline characteristics between the two groups. Both groups showed improvement in mHHS and NAHS; however, no significant differences were observed between the groups in the change scores (mHHS: p = 0.937, NAHS: p = 0.142). For MCID achievement, rates were comparable between groups for mHHS (anterior-only: 46.2%, anterior plus lateral: 42.9%). For NAHS, the anterior plus lateral group showed a higher achievement rate (85.7%) compared to the anterior-only group (69.2%). For PASS achievement, rates were similar between groups for mHHS (anterior-only: 61.5%, anterior plus lateral: 57.1%). For NAHS, the anterior plus lateral group demonstrated a higher rate (71.4%) compared to the anterior-only group (46.2%). However, no statistically significant differences were observed in any outcome measures. Discussion Cam resection based on planning incorporating lateral impingement showed a trend toward improved clinical outcomes, although no statistically significant differences were observed. This may be due to the limited sample size and short follow-up period. Considering lateral impingement, in addition to anterior impingement, may provide a more comprehensive understanding of FAI pathology and contribute to optimization of surgical strategy. Conclusion Cam resection based on preoperative planning incorporating lateral impingement may improve clinical outcomes; however, no significant differences were observed in this cohort.
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Authors Kazunari Ogura, Naomi Kobayashi, Shota Higashihira, Yutaka Inaba
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.314
URL
https://doi.org/10.1093/jhps/hnag043.314
Keywords Keywords not found

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